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A user is told to enter a proxy configuration file path: proxy-url-file:///etc/proxy/config . While typing in a plain text field that doesn’t accept special characters, they replace : with the word colon or 3A and / with slash or 2F . Over time, in documentation or forum posts, it degrades to proxy-url-file-3A-2F-2F-2F .
To prevent a proxy from being used to access local files, developers should implement a strategy: Protocol Whitelisting Restrict the proxy to only allow http:// and https:// . ❌ Reject : file:// , gopher:// , ftp:// , php:// ✅ Allow : https:// Hostname Validation proxy-url-file-3A-2F-2F-2F
| String | Decoded | Common Context | |--------|---------|----------------| | file-3A-2F-2F-2F | file:/// | Local file access | | http-3A-2F-2F | http:// | Web requests | | https-3A-2F-2F | https:// | Secure web | | proxy-url-file-3A-2F-2F-2F | proxy-url-file:/// | Unknown/custom | A user is told to enter a proxy
: Refers to the file:// URI scheme, used to access files on your own local hard drive or a network share. 3A-2F-2F-2F : This is the "encoded" part of the string. 3A = : (colon) 2F = / (forward slash) The Decoded Result : file:/// To prevent a proxy from being used to